Typewriter support



May 18. 1954 F. s. PALIUCA TYPEWRITER SUPPORT 3 Sheets-Sheet 1 FiledOct. 1, 1951 II/IIIIIIIIII/IIII Frank 6, Pal/00a IN VEN TOR.

y 8, 1954 F. e. PALIUCA TYPEWRITER SUPPORT 3 Sheets-Sheet 2 Filed Oct.1, 1951 Fig. 2

Frank 6. Pa/iuca INVENTOR. B Y wt.

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y 18, 1954 F. c. PAuucA 2,678,862

TYPEWRITER SUPPORT Filed Oct. 1, 1951 3 Sheets-Sheet 3 Fig. 4

l6 Fran/r 6. Pal/210a INVENTOR.

9 BY A...

Patented May 18, 1954 umsssmwr PATENT OFFICE National Office SupplyMfg.Co., Inc., Mass., a corporation of Massachusetts Boston, I

Application: Qotober 1, 1951, Serial No'. 249,023

My invention relates to improvements intypewriter supports for use asequipment for typewriter desks.

Th primary object of my invention is to provide a simple form ofcarriage for a typewriter supporting platform which is mounted in thestorage compartment of a typewriter desk for travel forwardly andrearwardly therein to project the platform out of the compartment andretract the same into the compartment, respectively, and embodies sprinloaded levers for elevating the projected platform which are lockedagainst operation to elevate the platform until the carriage has beenpulled forwardly to fully project the platform out of the compartment.

Another object is to provide a novel simple form of lock for the leversunlocked by pulling the carriage forwardly and by engagement with a partof the desk.

Other and subordinate objects, within the purview of my invention,together with the precise nature of my improvements will be readilyunderstood when the succeeding description and claim are read withreference to the drawings accompanying and forming part of thisspecification.

In said drawings:

Figure 1 is a fragmentary view in perspective, partly broken away andshown in section, and i1- lustrating my mounted in the storagecompartment of a typewriter desk with the platform lowered and partlyretracted;

Figure 2 is a View in transverse vertical section, drawn to a smallerscale, with the carriage 273- in its rearmost platform retractinposition and the levers in platform lowerin position;

Figure 3 is a similar view with the carriage in its forward limit ofplatform projecting movement and the levers in platform elevatingposi-'- tion;

Figure 4 is a fragmentary enlarged view partly in longitudinal sectionand partly in side elevation of the carriage, one of the tracks, theplatform, and parts associated with the levers, and the levers shown inplatform elevating position;

Figure 5 is a view in vertical transverse section taken on the line 5-5of Figure 4;

Figure 6 is a fragmentary view in plan of the lock means for the levers;and

Figure 7 is a similar view illustrating the means for unlocking thelock.

Referring to the drawings by numerals, my typewriter support is designedfor mounting in the usual typewriter storage compartment I beimprovedtypewriter support 1 Claim. (01. 312- 28) low the top 2 and at one endof the typewriter desk 3, the compartment having front and rear uprights4, 5 at the corners thereof and at opposite sides of the compartment,the uprights 4 being formed by end legs of the desk.

The typewriter support comprises a pair of metal channel bar tracks 6fixed horizontally to opposite sides of the compartment lwith channelsides facing and by means ofscrews 7 turned into the front and rear ends4, 5 of said tracks. The tracks 5 are disposed substantially midwaybetween the top and bottom of the compartment l.

A platform supporting carriage 9 is supported by the tracks 6 to travelforwardly and rearwardly in the compartment l. The carriage 9 comprisesa pair of vertical oblong plates H1 at opposite sides thereof extendingendwise alongside the tracks d between said tracks and provided withrollers 14, I6 at the front and rear ends thereof running in the tracks6 and mounted on studs ll fixed in said plates H). An inverted U-shapedyoke bar 18 upstanding from the rear ends of the plates I 0 and weldedthereto, as at l9, connects said plates together to travel in unison.

The carriage 9 further includes side pairs of front and rear bellcranklevers 26, 2| pivoted at the angles thereof on the studs I! adjacent thefront and rear ends of the plates H] for vertical swingin movement andeach comprising a short lever arm 23 and a long lever arm 24. The shortlever arms 23 of each side pair of bellcrank levers 20, 2| are connectedtogether to swing in unison by a horizontal link 26 having downturnedends 21, pivoted, as at 28, to said short lever arms 23. A cross rod 29connects the long lever arms 24 of the rear bellcrank levers 21 forswinging in unison.

An angle bar 36 is pivotally connected at its ends, as at 32, to theterminals of the long lever arms 24 of each pair of bellcrank levers.

A platform 66 for supporting the typewriter 42 extends forwardly of thedescribed carriage 9 with rear corner arms 44 bolted, as at 46, in theangle bars 30.

The bellcrank levers 20, 2| are swingable counterclockwise, as viewed inFigures 2, 3 and 4 until the long lever arms 24 are in depending loweredvertical position to lower the platform 40 from from elevatedhorizontal, typewriter operative position, and swingable clockwise, asviewed in said figures, to position the long lever arms 24 in raisedupstanding position to elevate said plat form it in typewriter operativeposition. The

links 26 engage the front studs H to establish the platform loweringposition of said bellorank levers 29, 2! and similarly engag the rearstuds IT to establish the platform raising position of said levers. Thecarriage 9 is operated rearwardly in the compartment i when the platform40 is lowered so as to house said platform 19 and typewriter 32 in saidcompartment l, and is operative into forward position by pulling on saidplatform is to project the platform 40 out of said compartment.

A pair of coil springs 45 on opposite sides of the carriage 9, connectedat the ends thereof to the top of the yoke bar [8, and to the rod'-29'exert yielding pull on the lon'glever arms 24 of the rear bellcranklevers 20, 2|, when said arms 24 are in depending platform loweringposition, to maintain said arms in said position, said springs afterinitial swinging of said arms clockwise past an intermediate positionand toward platform raising position acting toswing said arms 24, andhence the bellcranklevers 2i), 2!, into platform elevating position.

A third coil spring 41' is connected at one end to said rod 29 and hasits other end connected to the rear edge of the platform 3% by aneyebolt dflthrea'dedly adjustable in a socket 59 secured to the platformit-by screws 52. The pull of the spring 41, when the long lever arms 24are in platform lowering position is directed rearwardly against saidplatform so as to assist in maintaining said'arms- 24, and hence thebellcranks 20, 2| in said position. However. when said arms 24 are swungto elevate the platform 46, and reach, together with the platform, aposition slightly above the pivots l'l, said spring l! by exertingrearward pull against the platform 40 supplements the springs 45 inswinging said arms 24, which is to say the bellcrank levers 20,-. 2|into platform elevating position. As will be understood, the springs 45,41 in swinging the bellcrank levers 20, 2| into platform elevatingposition balance the weight of the platform 40 and typewriter- 42.

Looking means is provided to prevent: the bell crank levers 20, 2| fromswinging into platform elevating position comprising the. following. Asubstantially Z-shaped latch dog 60 is pivoted intermediate its ends, asat'62, in horizontal position on a lateral lug Mon the. outside of one:of the'plates H3 adjacent its front end. A suitably arranged coil spring66 on the pivot 52 operatively connected to said dog 60 yieldingly rockssaid dog in one direction, counterclockwise, as viewed in Figures 6 and'7, to insert one end 51 of saiddog through a slot 68 in said plate I Band into overlying relation to the adjacent link 26, whereby said dognormally prevents upward swinging of said link 26 when the bellcranklevers 20, 21 are in platform lowering position, whereby to lock saidleversin that position and the platform 40 lowered.

As the carriage 9 is moved forwardly, manually, into its limit offorward movement, the other end 69 of the locking dog Ellis brought intoabutting engagement with one of the front uprightsd and thereby swung inthe opposite direction against the tension of the swing E6 to'withdrawsaid end 61 fromoverlying relation to the adjacent link I2 and therebyunlock the bellcrank levers 20, 2| for swinging into platform elevatingposition;

The slot 68 establishes the locking position of the locking dog 60 andthe end 61 engages the plate l0 carrying the dog and establishes theunlocking position of said dog. The end 69 of the locking dog 60 in itsunlocking position, and by engagement with the aforementioned uprights 4establishes the forward limit of movement of the carriage 9.

A feature of the described locking means for the bellcrank levers 20, 2|is that the carriage 9 must be maintained in its forward limit ofmovement while said bellcrank levers are swung into platform loweringposition because, if the locking dog 60 is disengaged from its upright4, said dog will interfere with swinging of the engaging link 20 in amanner to prevent swinging of the bellcrank levers 20, 2! into platformlowering position. Obviously, when the bellcrank levers 20, 21 swinginto complete platform lowering position, the locking dog 60 will snapinto locking position and'the carriage 9 may'then be moved rearwardly inthe compartment I to house the platform 40 and typewriter 42.

The foregoing will, it is believed, suffice to impart a clearunderstanding of my invention, withoutfurther explanation, since theoperation ofthesupport has been set forth in connection with thedescription of the parts.

Manifestly, the invention, as described, is susceptible of modification,without departing from the inventive concept, and right is hereinreserved to such modifications as fall within the scope of the appendedclaim.

Having. described the invention, what is claimed as new is:

A typewriter support comprising a pair of opposite horizontal tracks. acarriage movable forwardly and rearwardly on said tracks and including apair of side plates having front and rear track engaging rollers mountedon front and rear studs on the plates, a typewriter supporting platform,front and rear pairs of levers pivoted tosaid plates and platform forswinging in unison in opposite directions past an intermediate positionto raise and lower said platform, links connecting the levers in thepairs for swinging in unison and vertically movable by swinging of thelevers, spring means for swinging the levers in unisonpast saidintermediate position in the direction to raise said platform, a fixedabutment in advance of said carriage, and a spring pressed Z-shapedlocking dog on one side plate having a locking end normally overlyingone of said links toilock said link to said plate against verticalmovement inthe lowered position of the platform, said dog beingswingable into unlocking position and having an opposite end engagcablewith said abutment to swing said dog when said carriage :is movedforwardly, said clog lying in a horizontalplane so that'its locking endwill ovenlie said one link and so that its opposite end is engageablewith said abutment.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date Re. 13,832 Vaaler Nov. 24, 1914 934,861 Vaaler Sept. 21. 19091,904,217 Fox Apr. 18, 1933 2,524,386 Johnston Oct. 3, 1950 2,557,735Fox June 19, 1951

